The text provided does not contain any spelling, typographical, grammatical, OCR, or mathematical errors.
Added by Vicenta G.
Close
Step 1
Step 1: Read the text carefully to identify any errors. Show more…
Show all steps
Your feedback will help us improve your experience
Adi S and 96 other Physics 102 Electricity and Magnetism educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
22. The total power consumed by a balanced three-phase load is 3, 000 Watts at 80 % power factor. Two wattmeters WA and WB are connected to the line. What is the reading of WA? A. 2, 150 Watts B. 2, 000 Watts C. 1, 500 Watts D. 2, 500 Watts REE - September 2008 23. In a balanced three-phase 230 V circuit, the line current is 90 A. The power is measured by two-wattmeter method. If the power factor is 100 % and the line current is the same, what is the reading on each wattmeter? A. 25.6 kW B. 30.4 kW C. 17.9 kW D. 20.7 kW 24. The two-wattmeter method is applied to a three-phase, three-wire, 100 V, ABC system with the meters in lines B and C, WB = 836 Watts and WC = 224 Watts. What is the impedance of the balanced delta-connected load? A.10∠45° Ω B. 10∠ - 45° Ω C. 20∠ - 45° Ω D. 20∠45° Ω REE - September 2009 25. A three-phase, wye-connected system with 240 V per phase is connected to three loads: 10 ohms, 18.79 + j6.84 ohms, 9.83 - j6.88 ohms to phases A, B, and C, respectively. Find the current in phase C with phase sequence ACB. A. 1.74 + j19.92 A B. -1.74 + j19.92 A C. -1.74 - j19.92 A D. 1.74 - j19.92 A 26. Three impedances Zab = 4 - j3 ohms, Zbc = 3 + j4 ohms, and Zca = 10 + j0 ohms are connected in delta across a 220 Volts, three phase balanced source. The total power of the circuit is __________. A. 1, 839 W B. 18, 392 W C. 1, 936 W D. 1, 849 W 27. A three-phase, four-wire system has the following unbalanced loads: Za = 10 + j10 Ω , Zb = 13 - j2 Ω , Zc = 7.5 + j10 Ω . Determine the total power delivered to the load if the line voltage is 208 V. A. 4.48 kW B. 1.48 kW C. 2.49 kW D. 2.90 kW REE - April 2005 28. A 3-phase 4-wire system has the following unbalanced loads: Z1 = 10 + j5 Ω , Z2 = 8 + j4 Ω , and Z3 = 20 + j0 Ω . The line to neutral voltage of the system is 120 Volts. What is the reading of the wattmeter in watts in Z3? A. 900 B. 720 C. 1, 000 D. 1, 050
Adi S.
Si se desea transmitir la potencia del generador del problema anterior por una línea de transmisión que tiene una resistencia por unidad de longitud, R / L = 0.220 Ω / km que tiene una longitud de 50 km, conectando directamente el generador a la línea de transmisión con el mismo voltaje y corriente eléctrica del problema anterior, ±Cuál es el porcentaje de pérdida de potencia eléctrica en la transmisión? Si en lugar de conectar el generador del problema anterior directamente a la línea de transmisión, se utiliza un transformador ideal que eleve el voltaje y que entregue la misma potencia, ±Cuál debe ser el voltaje a la salida del transformador para que las pérdidas en la línea sean del 15%? ±Cuál es el número de vueltas en el devanado secundario?
1000 ̐ resistor, inductor and capacitor are connected in a circuit and the resonant frequency found to be 7000 Hz. What is the value of the inductor? A) 83 Hz B) 65 Hz C) 0.45 mH D) 7.2 mF E) 1.0 mH F) 0.31 mF G) 0.88 mH H) None of these. A thin copper rod 10 m long has a mass of 0.050 kg and is in a magnetic field of 10 T. What minimum force is needed in order for the magnetic force to cancel the weight of the rod? A) 12 N B) 9.8 N C) 4.9 N D) 15 N E) 3.7 N F) None of these. An ideal transformer has 40 turns on its primary coil and 360 turns on its secondary coil. If a voltage of 2.0 A is applied to the primary, what is the voltage change in the secondary? A) Vs = 16 Vp B) Vs = 8.0 Vp C) Vs = 0.83 Vp D) Vs = 2.9 Vp E) None of these. If 120 kW of electric power is sent to a town from a power plant, and the total resistance of the transmission lines is 0.40 ̐, calculate the power loss (PL) if the power is transmitted at a voltage of 2400 V and the power is transmitted at a voltage of 240 V. A) PL = 100 W B) PL = 10 W C) PL = 100 kW D) None of these.
Morgan C.
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD